Primary intermediates for oxidative coloration of hair

ABSTRACT

Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1):                    
     wherein R 1  and R 2  are each independently selected from hydrogen atoms, a C 1  to C 5  alkyl or hydroxyalkyl group, or R 1  and R 2  together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R 1  and R 2  may be hydrogen.

This application claims priority from US Provisional Application60/263,544, filed Jan. 23, 2001.

FIELD OF THE INVENTION

This invention relates to new 4-amino-2-(2 or 3-amino or substitutedamino-ethyl or propyl)-phenol compounds and compositions containingthese new compounds, as primary intermediates for oxidative coloring ofhair fibers.

BACKGROUND OF THE INVENTION

Coloration of hair is a procedure practiced from antiquity employing avariety of means. In modern times, the method most extensively to colorhair is an oxidative dyeing process utilizing one or more oxidative haircoloring agents in combination with one or more oxidizing agents.

Most commonly a peroxy oxidizing agent is used in combination with oneor more oxidative hair coloring agents, generally small moleculescapable of diffusing into hair and comprising one or more primaryintermediates and one or more couplers. In this procedure, a peroxidematerial, such as hydrogen peroxide, is employed to activate the smallmolecules of primary intermediates so that they react with couplers toform larger sized compounds in the hair shaft to color the hair in avariety of shades and colors.

A wide variety of primary intermediates and couplers have been employedin such oxidative hair coloring systems and compositions. Among theprimary intermediates employed there may be mentionedp-phenylenediamine, p-toluenediamine, p-aminophenol,4-amino-3-methylphenol, N,N-bis(2-hydroxyethyl)-p-phenylene diamine,1-(2-hydroxyethyl)-4,5-diaminopyrazole and as couplers there may bementioned resorcinol, 2-methylresorcinol, 3-aminophenol,2,4-diaminophenoxyethanol, and 5-amino-2-methylphenol.

There are numerous additional requirements for oxidation dye compoundsthat are used to dye human hair besides the color or the desiredintensity. Thus, the dye compounds must be unobjectionable in regard totoxicological and dermatological properties and must provide the desiredhair color with a good light fastness, fastness to a permanent wavetreatment, acid fastness and fastness to rubbing. The color of the hairdyed with the dye compounds in each case must be stable for at least 4to 6 weeks to light, rubbing and chemical agents. Furthermore, anadditional requirement is the production of a broad palette of differentcolor shades using different developer and coupler substances. Many ofthe desired shades have been produced with dyes based on p-aminophenol.However, as indicated in U.S. Pat. No. 4,997,451, the use ofp-aminophenol is being questioned, for possible toxicological reasons.The proposed replacements for p-aminophenol have not proved entirelysatisfactory. There is therefore a need for new primary intermediatecompounds to meet one or more of the desired properties but notpossessing the possible toxicological drawbacks possessed byp-aminophenol.

SUMMARY OF THE INVENTION

It is therefore an object of this invention to provide new primaryintermediate compounds useful in place of p-aminophenol to provide awide range of different color shades with various combinations ofprimary intermediates and couplers, but which avoids the drawback ofp-aminophenol.

It has been discovered that the new 4-amino-2-(2 or 3-amino orsubstituted amino-ethyl or propyl)-phenol compounds are suitable primaryintermediates for hair coloring compositions and systems for providinggood oxidative coloration of hair and for providing acceptable lightfastness, fastness to shampooing, good selectivity, fastness toperspiration and permanent wave treatment, and suitable for providing awide variety of different color shades with various primary intermediateand coupler compounds.

The invention provides new 4-amino-2-(2 or 3-amino or substitutedamino-ethyl or propyl)-phenol compounds of formula (1):

wherein R₁ and R₂ are each independently selected from hydrogen atoms, aC₁ to C₅ alkyl or hydroxyalkyl group, or R₁ and R₂ together with thenitrogen atom to which they are attached form a 5 or 6 member cyclicring optionally containing one or more additional atoms selected from O,N or S atoms, such as a piperazine, piperidine, imidazole, ormorpholine, and n is equal to 1 or 2, with the proviso that when n isequal to 2 only one of R₁ and R₂ may be hydrogen.

These novel primary intermediates are used to provide coloration to hairin which there is good dye uptake by the hair and provides shades orcolors which are stable over a relatively long period of time. The novelprimary intermediates provide for dyeing of hair to impart color orshades that possess good wash fastness and do not undergo significantchanges on exposure to light or shampooing.

DETAILED DESCRIPTION OF THE INVENTION

The new 4-amino-2-(2 or 3-amino or substituted amino-ethyl orpropyl)-phenol compounds of formula (1) of this invention can beprepared according to the following reaction sequence, where R₁ and R₂are as defined hereinbefore:

In this synthesis procedure nitration of 2-coumaranone ordihydrocoumarin of formula (2) with nitric acid/sulfuric acid produces acompound of formula (3). Reaction of the compound of formula (3) with areagent of the formula R₁R₂NH provides a compound of formula (4).Reduction of the compound of formula (4) with borane-THF complexproduces a compound of formula (5). Catalytic hydrogenation of thecompound of formula (5) with Pd/C under hydrogen produces a compound offormula (1).

SYNTHESIS EXAMPLES 1 TO 11

Employing 2-coumaranone or dihydrocoumarin and the appropriate reagentof the formula R₁R₂NH in this synthesis procedure produces the followingcompounds:

4-amino-2-(2-dimethylamino-ethyl)-phenol;

4-amino-2-(3-dimethylamino-propyl)-phenol;

4-amino-2-(2-diethylamino-ethyl)-phenol;

4-amino-2-(3-diethylamino-propyl)-phenol;

4-amino-2-(3-amino-propyl)-phenol;

4-amino-2-(2-piperidin-1-ylethyl)-phenol;

4-amino-2-(3-piperidin-1-ylpropyl)-phenol;

4-amino-2-[2-(pyridin-3-ylamino)ethyl]-phenol;

4-amino-2-(2-imidazol-1-ylethyl)-phenol;

4-amino-2-(2-morpholin-1-ylethyl)-phenol; and

4-amino-2-[2-(2-hydroxyethylamino)-ethyl]-phenol.

As used herein, the term “hair dyeing composition” (also synonymouslyreferred to herein as the hair dye composition, the hair coloringcomposition, or the hair dye lotion) refers to the compositioncontaining oxidation dyes, including the novel compounds describedherein, prior to admixture with the developer composition. The term“developer composition” (also referred to as the oxidizing agentcomposition or the peroxide composition) refers to compositionscontaining an oxidizing agent prior to admixture with the hair dyeingcomposition. The term “hair dye product” or “hair dye system” (alsoreferred to as the hair dyeing system, hair dyeing product, or haircoloring system) interchangeably refer to the combination of the hairdyeing composition and the developer composition before admixture, andmay further include a conditioner product and instructions, such productor system often being provided packaged as a kit. The term “hair dyeingproduct composition” refers to the composition formed by mixing the hairdyeing composition and the developer composition. “Carrier” (or vehicleor base) refers to the combination of ingredients contained in acomposition excluding the active agents (e.g., the oxidation hair dyesof the hair dyeing composition).

Hair coloring (i.e., hair dyeing) compositions of this invention cancontain, in combination with oxidation dye couplers, a novel primaryintermediate of this invention as the sole primary intermediate or canalso contain other primary intermediates. Thus, one or more suitableprimary intermediates may be used in combination with the novel primaryintermediates of this invention.

Suitable known primary intermediates include, for example,

p-phenylenediamine derivatives such as: benzene-1,4-diamine (commonlyknown as p-phenylenediamine), 2-methyl-benzene-1,4-diamine,2-chloro-benzene-1,4-diamine, N-phenyl-benzene-1,4-diamine,N-(2-ethoxyethyl)benzene-1,4-diamine,2-[(4-amino-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol, (commonly known asN,N-bis(2-hydroxyethyl)-p-phenylenediamine)(2,5-diamino-phenyl)-methanol,1-(2,5-diamino-phenyl)-ethanol, 2-(2,5-diamino-phenyl)-ethanol,N-(4-aminophenyl)benzene-1,4-diamine, 2,6-dimethyl-benzene-1,4-diamine,2-isopropyl-benzene-1,4-diamine, 1-[(4-aminophenyl)amino]-propan-2-ol,2-propyl-benzene-1,4-diamine,1,3-bis[(4-aminophenyl)(2-hydroxyethyl)amino]propan-2-ol,N⁴,N⁴,2-trimethylbenzene-1,4-diamine, 2-methoxy-benzene-1,4-diamine,1-(2,5-diaminophenyl)ethane-1,2-diol, 2,3-dimethyl-benzene-1,4-diamine,N-(4-amino-3-hydroxy-phenyl)-acetamide, 2,6-diethylbenzene-1,4-diamine,2,5-dimethylbenzene-1,4-diamine, 2-thien-2-ylbenzene-1,4-diamine,2-thien-3-ylbenzene-1,4-diamine, 2-pyridin-3-ylbenzene-1,4-diamine,1,1′-biphenyl-2,5-diamine, 2-(methoxymethyl)benzene-1,4-diamine,2-(aminomethyl)benzene-1,4-diamine, 2-(2,5-diaminophenoxy)ethanol,N-[2-(2,5-diaminophenoxy)ethyl]-acetamide,N,N-dimethylbenzene-1,4-diamine, N,N-diethylbenzene-1,4-diamine,N,N-dipropylbenzene-1,4-diamine, 2-[(4aminophenyl)(ethyl)amino]ethanol,2-[(4-amino-3-methyl-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol,N-(2-methoxyethyl)-benzene-1,4-diamine,3-[(4-aminophenyl)amino]propan-1-ol,3-[(4-aminophenyl)-amino]propane-1,2-diol,N-{4-[(4-aminophenyl)amino]butyl}benzene-1,4-diamine, and2-[2-(2-{2-[(2,5-diaminophenyl)-oxy]ethoxy}ethoxy)ethoxy]benzene-1,4-diamine;

p-aminophenol derivatives such as: 4-amino-phenol (commonly known asp-aminophenol), 4-methylamino-phenol, 4-amino-3-methyl-phenol,4-amino-2-hydroxymethyl-phenol, 4-amino-2-methyl-phenol,4-amino-2-[(2-hydroxy-ethylamino)-methyl]-phenol,4-amino-2-methoxymethyl-phenol, 5-amino-2-hydroxy-benzoic acid,1-(5-amino-2-hydroxy-phenyl)-ethane-1,2-diol,4-amino-2-(2-hydroxy-ethyl)-phenol, 4-amino-3-(hydroxymethyl)phenol,4-amino-3-fluoro-phenol, 4-amino-2-(aminomethyl)-phenol, and4-amino-2-fluoro-phenol;

o-aminophenol derivatives such as: 2-amino-phenol (commonly known aso-aminophenol), 2,4-diaminophenol, 2-amino-5-methyl-phenol,2-amino-6-methyl-phenol, N-(4-amino-3-hydroxy-phenyl)-acetamide, and2-amino-4-methyl-phenol; and

heterocyclic derivatives such as: pyrimidine-2,4,5,6-tetramine (commonlyknown as 2,4,5,6-tetraaminopyridine), 1-methyl-1H-pyrazole-4,5-diamine,2-(4,5-diamino-1H-pyrazol-1-yl)ethanol, N²,N²-dimethyl-pyridine-2,5-diamine,2-[(3-amino-6-methoxypyridin-2-yl)amino]ethanol,6-methoxy-N²-methyl-pyridine-2,3-diamine,2,5,6-triaminopyrimidin-4(1H)-one, pyridine-2,5-diamine,1-isopropyl-1H-pyrazole-4,5-diamine,1-(4-methylbenzyl)-1H-pyrazole-4,5-diamine,1-(benzyl)-1H-pyrazole-4,5-diamine, and1-(4-chlorobenzyl)-1H-pyrazole-4,5-diamine.

The novel primary intermediates of formula (1) of this invention may beused with any suitable coupler(s) in hair coloring compositions orsystems of this invention.

Suitable known couplers include, for example:

phenols, resorcinol and naphthol derivatives such as:naphthalene-1,7-diol, benzene-1,3-diol, 4-chlorobenzene-1,3-diol,naphthalen-1-ol, 2-methyl-naphthalen-1-ol, naphthalene-1,5-diol,naphthalene-2,7-diol, benzene-1,4-diol, 2-methyl-benzene-1,3-diol,7-amino-4-hydroxy-naphthalene-2-sulfonic acid,2-isopropyl-5-methylphenol, 1,2,3,4-tetrahydro-naphthalene-1,5-diol,2-chloro-benzene-1,3-diol, 4-hydroxy-naphthalene-1-sulfonic acid,benzene-1,2,3-triol, naphthalene-2,3-diol,5-dichloro-2-methylbenzene-1,3-diol, 4,6-dichlorobenzene-1,3-diol, and2,3-dihydroxy-[1,4]naphthoquinone;

m-phenylenediamines such as: 2,4-diaminophenol, benzene-1,3-diamine,2-(2,4-diamino-phenoxy)-ethanol,2-[(3-amino-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol,2-mehyl-benzene-1,3-diamine,2-[[2-(2,4-diamino-phenoxy)-ethyl]-(2-hydroxy-ethyl)-amino]-ethanol,4-{3-[(2,4-diaminophenyl)oxy]propoxy}benzene-1,3-diamine,2-(2,4-diamino-phenyl)-ethanol,2-(3-amino-4-methoxy-phenylamino)-ethanol,4-(2-amino-ethoxy)-benzene-1,3-diamine, (2,4-diamino-phenoxy)-aceticacid, 2-[2,4-diamino-5-(2-hydroxy-ethoxy)-phenoxy]-ethanol,4-ethoxy-6-methyl-benzene-1,3-diamine,2-(2,4-diamino-5-methyl-phenoxy)-ethanol,4,6-dimethoxy-benzene-1,3-diamine,2-[3-(2-hydroxy-ethylamino)-2-methyl-phenylamino]-ethanol,3-(2,4-diamino-phenoxy)-propan-1-ol, N-[3-(dimethylamino)phenyl]urea,4-methoxy-6-methylbenzene-1,3-diamine,4-fluoro-6-methylbenzene-1,3-diamine,2-({3-[(2-hydroxyethyl)amino]-4,6-dimethoxyphenyl}-amino)ethanol,3-(2,4-diaminophenoxy)-propane-1,2-diol,2-[2-amino-4-(methylamino)-phenoxy]ethanol,2-[(5-amino-2-ethoxy-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol,2-[(3-aminophenyl)amino]ethanol, N-(2-aminoethyl)benzene-1,3-diamine,4-{[(2,4-diamino-phenyl)oxy]methoxy}-benzene-1,3-diamine, and2,4-dimethoxybenzene-1,3-diamine;

m-aminophenols such as: 3-amino-phenol,2-(3-hydroxy-4-methyl-phenylamino)-acetamide,2-(3-hydroxy-phenylamino)-acetamide, 5-amino-2-methyl-phenol,5-(2-hydroxy-ethylamino)-2-methyl-phenol, 5-amino-2,4-dichloro-phenol,3-amino-2-methyl-phenol, 3-amino-2-chloro-6-methyl-phenol,5-amino-2-(2-hydroxy-ethoxy)-phenol,2-chloro-5-(2,2,2-trifluoro-ethylamino)-phenol,5-amino-4-chloro-2-methyl-phenol, 3-cyclopentylamino-phenol,5-[(2-hydroxyethyl)amino]-4-methoxy-2-methylphenol,5-amino-4-methoxy-2-methylphenol, 3-(dimethylamino)phenol,3-(diethylamino)phenol, 5-amino-4-fluoro-2-methylphenol,5-amino-4-ethoxy-2-methylphenol, 3-amino-2,4-dichloro-phenol,3-[(2-methoxyethyl)amino]phenol, 3-[(2-hydroxyethyl)amino]phenol,5-amino-2-ethyl-phenol, 5-amino-2-methoxyphenol,5-[(3-hydroxypropyl)amino]-2-methylphenol,3-[(3-hydroxy-2-methylphenyl)-amino]propane-1,2-diol, and3-[(2-hydroxyethyl)amino]-2-methylphenol; and

heterocyclic derivatives such as: 3,4-dihydro-2H-1,4-benzoxazin-6-ol,4-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one,6-methoxyquinolin-8-amine, 4-methylpyridine-2,6-diol,2,3-dihydro-1,4-benzodioxin-5-ol, 1,3-benzodioxol-5-ol,2-(1,3-benzodioxol-5-ylamino)ethanol, 3,4-dimethylpyridine-2,6-diol,5-chloropyridine-2,3-diol, 2,6-dimethoxypyridine-3,5-diamine,1,3-benzodioxol-5-amine,2-{[3,5-diamino-6-(2-hydroxy-ethoxy)-pyridin-2-yl]oxy}-ethanol,1H-indol-4-ol, 5-amino-2,6-dimethoxypyridin-3-ol, 1H-indole-5,6-diol,1H-indol-7-ol, 1H-indol-5-ol, 1H-indol-6-ol,6-bromo-1,3-benzodioxol-5-ol, 2-aminopyridin-3-ol, pyridine-2,6-diamine,3-[(3,5-diaminopyridin-2-yl)oxy]propane-1,2-diol,5-[(3,5-diaminopyridin-2-yl)oxy]pentane-1,3-diol, 1H-indole-2,3-dione,indoline-5,6-diol, 3,5-dimethoxypyridine-2,6-diamine,6-methoxypyridine-2,3-diamine, and3,4-dihydro-2H-1,4-benzoxazin-6-amine.

Preferred primary intermediates include:

p-phenylenediamine derivatives such as: 2-methyl-benzene-1,4-diamine,benzene-1,4-diamine, 1-(2,5-diamino-phenyl)-ethanol,2-(2,5-diamino-phenyl)-ethanol, N-(2-methoxyethyl)benzene-1,4-diamine,2-[(4-amino-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol, and1-(2,5-diaminophenyl)ethane-1,2-diol;

p-aminophenol derivatives such as 4-amino-phenol, 4-methylamino-phenol,4-amino-3-methyl-phenol, 4-amino-2-methoxymethyl-phenol, and1-(5-amino-2-hydroxy-phenyl)-ethane-1,2-diol;

o-aminophenol derivatives such as: 2-amino-phenol,2-amino-5-methyl-phenol, 2-amino-6-methyl-phenol,N-(4-amino-3-hydroxy-phenyl)-acetamide, and 2-amino-4-methyl-phenol; and

heterocyclic derivatives such as: pyrimidine-2,4,5,6-tetramine,1-methyl-1H-pyrazole-4,5-diamine,2-(4,5-diamino-1H-pyrazol-1-yl)ethanol,1-(4-methylbenzyl)-1H-pyrazole-4,5-diamine,1-(benzyl)-1H-pyrazole-4,5-diamine, andN²,N²-dimethyl-pyridine-2,5-diamine.

Preferred couplers include:

phenols, resorcinol and naphthol derivatives such as:naphthalene-1,7-diol, benzene-1,3-diol, 4-chlorobenzene-1,3-diol,naphthalen-1-ol, 2-methyl-naphthalen-1-ol, naphthalene-1,5-diol,naphthalene-2,7-diol, benzene-1,4-diol, 2-methyl-benzene-1,3-diol, and2-isopropyl-5-methylphenol;

m-phenylenediamines such as: benzene-1,3-diamine,2-(2,4-diamino-phenoxy)-ethanol,4-{3-[(2,4-diaminophenyl)oxy]propoxy}benzene-1,3-diamine ,2-(3-amino-4-methoxy-phenylamino)-ethanol,2-[2,4-diamino-5-(2-hydroxy-ethoxy)-phenoxy]-ethanol, and3-(2,4-diamino-phenoxy)-propan-1-ol;

m-aminophenols such as: 3-amino-phenol, 5-amino-2-methyl-phenol,5-(2-hydroxy-ethylamino)-2-methyl-phenol, and 3-amino-2-methyl-phenol;and

heterocyclic derivatives such as: 3,4-dihydro-2H-1,4-benzoxazin-6-ol,4-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, 1,3-benzodioxol-5-ol,1,3-benzodioxol-5-amine, 1H-indol-4-ol, 1H-indole-5,6-diol,1H-indol-7-ol, 1H-indol-5-ol, 1H-indol-6-ol, 1H-indole-2,3-dione,pyridine-2,6-diamine, and 2-aminopyridin-3-ol.

Most preferred primary intermediates include:

p-phenylenediamine derivatives such as: 2-methyl-benzene-1,4-diamine,benzene-1,4-diamine, 2-(2,5-diamino-phenyl)-ethanol,1-(2,5-diamino-phenyl)-ethanol, and2-[(4-amino-phenyl)-(2-hydroxy-ethyl)-amino]-ethanol;

p-aminophenol derivatives such as: 4-amino-phenol, 4-methylamino-phenol,4-amino-3-methyl-phenol, and1-(5-amino-2-hydroxy-phenyl)-ethane-1,2-diol;

o-aminophenols such as: 2-amino-phenol, 2-amino-5-methyl-phenol,2-amino-6-methyl-phenol, and N-(4-amino-3-hydroxy-phenyl)-acetamide; and

heterocyclic derivatives such as: pyrimidine-2,4,5,6-tetramine,2-(4,5-diamino-1H-pyrazol-1-yl)ethanol,1-(4-methylbenzyl)-1H-pyrazole-4,5-diamine, and1-(benzyl)-1H-pyrazole-4,5-diamine.

Most preferred couplers include:

phenols, resorcinol and naphthol derivatives such as: benzene-1,3-diol,4-chlorobenzene-1,3-diol, naphthalen-1-ol, 2-methyl-naphthalen-1-ol, and2-methyl-benzene-1,3-diol;

m-phenylenediamine such as: 2-(2,4-diamino-phenoxy)-ethanol,2-(3-amino-4-methoxy-phenylamino)-ethanol,2-[2,4-diamino-5-(2-hydroxy-ethoxy)-phenoxy]-ethanol, and3-(2,4-diamino-phenoxy)-propan-1-ol;

m-aminophenols such as: 3-amino-phenol, 5-amino-2-methyl-phenol,5-(2-hydroxy-ethylamino)-2-methyl-phenol, and 3-amino-2-methyl-phenol;and

heterocyclic derivatives such as: 3,4-dihydro-2H-1,4-benzoxazin-6-ol,4-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, 1H-indol-6-ol, and2-aminopyridin-3-ol.

Understandably, the coupler compounds and the primary intermediatecompounds, including the novel compounds of the invention, in so far asthey are bases, can be used as free bases or in the form of theirphysiologically compatible salts with organic or inorganic acids, suchas hydrochloric, citric, acetic, tartaric, or sulfuric acids, or, in sofar as they have aromatic OH groups, in the form of their salts withbases, such as alkali phenolates.

The total amount of dye precursors (e.g., primary intermediate andcoupler compounds, including the novel compounds of this invention) inthe hair dyeing compositions of this invention is generally from about0.002 to about 20, preferably from about 0.04 to about 10, and mostpreferably from about 0.1 to about 7.0 weight percent, based on thetotal weight of the hair dyeing composition. The primary intermediateand coupler compounds are generally used in molar equivalent amounts.However, it is possible to use the primary intermediate compounds ineither excess or deficiency, i.e., a molar ratio of primary intermediateto coupler generally ranging from about 5:1 to about 1:5.

The hair dyeing compositions of this invention will contain the primaryintermediate of this invention in an effective dyeing amount, generallyin an amount of from about 0.001 to about 10 weight percent by weight ofthe hair dye composition, preferably from about 0.01 to about 5.0 weightpercent. Other primary intermediates, when present, are typicallypresent in an amount such that in aggregate the concentration of primaryintermediates in the composition is from about 0.002 to about 10 weightpercent, preferably from about 0.01 to about 5.0 weight percent. Thecoupler(s) are present in an effective dyeing concentration, generallyan amount of from about 0.001 to about 10.0 weight percent by weight ofthe hair dye composition, preferably from about 0.01 to about 5.0 weightpercent. The remainder of the hair dye composition comprises a carrieror vehicle for the couplers and primary intermediates, and comprisesvarious adjuvants as described below.

Any suitable carrier or vehicle, generally an aqueous or hydroalcoholicsolution, can be employed, preferably an aqueous solution. The carrieror vehicle will generally comprise more than 80 weight percent of thehair dye composition, typically 90 to 99 weight percent, preferably 94to 99 weight percent. The hair coloring compositions of this inventionmay contain as adjuvants one or more cationic, anionic, amphoteric, orzwitterionic surface active agents, perfumes, antioxidants such asascorbic acid, thioglycolic acid or sodium sulfite, chelating andsequestering agents such as EDTA, thickening agents, alkalizing oracidifying agents, solvents, diluents, inerts, dispersing agents,penetrating agents, defoamers, enzymes, and other dye agents (e.g.,synthetic direct and natural dyes). These adjuvants are cosmeticadditive ingredients commonly used in compositions for coloring hair.

The hair dye compositions of the present invention are used by admixingthem with a suitable oxidant, which reacts with the hair dye precursorsto develop the hair dye. Any suitable oxidizing agent can be employed inthe hair dye product compositions of this invention, particularlyhydrogen peroxide (H₂O₂) or precursors therefor. Also suitable are ureaperoxide, the alkali metal salts of persulfate, perborate, andpercarbonate, especially the sodium salt, and melamine peroxide. Theoxidant is usually provided in an aqueous composition generally referredto as the developer composition, which normally is provided as aseparate component of the finished hair dye product and present in aseparate container. The developer composition may also contain, to theextent compatible, various ingredients needed to form the developercomposition, i.e., peroxide stabilizers, foam formers, etc., and mayincorporate one or more of the adjuvants referred to above, e.g.,surface active agents, thickeners, pH modifiers, etc. Upon mixing thehair coloring composition and the developer composition to form a hairdye product composition, the adjuvants are provided in the hair dyeproduct composition as it is applied to the hair to achieve desiredproduct attributes, e.g., pH, viscosity, rheology, etc.

The form of the hair dye product compositions according to the inventioncan be, for example, a solution, especially an aqueous oraqueous-alcoholic solution. However, the form that is preferred is athick liquid cream, gel or an emulsion whose composition is a mixture ofthe dye ingredients with the conventional cosmetic additive ingredientssuitable for the particular preparation.

Suitable conventional cosmetic additive ingredients useful in the hairdye and developer compositions, and hence in the hair dye productcompositions of this invention are described below, and may be used toobtain desired characteristics of the hair dye, developer, and hair dyeproduct compositions.

Solvents: In addition to water, solvents that can be used are loweralkanols (e.g., ethanol, propanol, isopropanol, benzyl alcohol); polyols(e.g., carbitols, propylene glycol, hexylene glycol, glycerin). See WO98/27941 (section on diluents) incorporated by reference. See also U.S.Pat. No. 6,027,538 incorporated by reference. Under suitable processing,higher alcohols, such as C8 to C18 fatty alcohols, especially cetylalcohol, are suitable organic solvents, provided they are firstliquified by melting, typically at low temperature (50 to 80° C.),before incorporation of other, usually lipophilic, materials.

The organic solvents are typically present in the hair dye compositionsin an amount of from about 5 to about 30% by weight of the hair dyecomposition. Water is usually present in an amount of from about 5 toabout 90% by weight of the hair dye composition, preferably from about15 to about 75% by weight and most preferably from about 30 to about 65%by weight.

Surfactants: These materials are from the classes of anionic, cationic,amphoteric (including zwitterionic surfactants) or nonionic surfactantcompounds. (Cationic surfactants, generally included as hairconditioning materials, are considered separately below.) Suitablesurfactants, other than cationic surfactants, include fatty alcoholsulfates, ethoxylated fatty alcohol sulfates, alkylsulfonates,alkylbenzensulfonates, alkyltrimethylammonium salts, alkylbetaines,ethoxylated fatty alcohols, ethoxylated fatty acids, ethoxylatedalkylphenols, block polymers of ethylene and/or propylene glycol,glycerol esters, phosphate esters, fatty acid alkanol amides andethoxylated fatty acid esters, alkyl sulfates, ethoxylated alkylsulfates, alkyl glyceryl ether sulfonates, methyl acyl taurates, acylisethionates, alkyl ethoxy carboxylates, fatty acid mono- anddiethanolamides. Especially useful are sodium and ammonium alkylsulfates, sodium and ammonium ether sulfates having 1 to 3 ethyleneoxide groups, and nonionic surfactants sold as Tergitols, e.g., C11-C15Pareth-9, and Neodols, e.g., C12-C15 Pareth-3. They are included forvarious reasons, e.g., to assist in thickening, for forming emulsions,to help in wetting hair during application of the hair dye productcomposition, etc. Amphoteric surfactants include, for example, theasparagine derivatives as well betaines, sultaines, glycinates andpropionates having an alkyl or alkylamido group of from about 10 toabout 20 carbon atoms. Typical amphoteric surfactants suitable for usein this invention include lauryl betaine, lauroamphoglycinate,lauroamphopropionate, lauryl sultaine, myristamidopropyl betaine,myristyl betaine, stearoamphopropylsulfonate, cocamidoethyl betaine,cocamidopropyl betaine, cocoamphoglycinate, cocoamphocarboxypropionate,cocoamphocarboxyglycinate, cocobetaine, and cocoamphopropionate.Reference is made to WO 98/52523 published Nov. 26, 1998 and WO 01/62221published Aug. 30, 2001, both incorporated herein by reference thereto.

The amount of surfactants in the hair dye compositions is normally fromabout 0.1% to 30% by weight, preferably 1% to 15% by weight.

Thickeners: Suitable thickeners include such as higher fatty alcohols,starches, cellulose derivatives, petrolatum, paraffin oil, fatty acidsand anionic and nonionic polymeric thickeners based on polyacrylic andpolyurethane polymers. Examples are hydroxyethyl cellulose,hydroxymethylcellulose and other cellulose derivatives, hydrophobicallymodified anionic polymers and nonionic polymers, particularly suchpolymers having both hydrophilic and hydrophobic moieties (i.e.,amphiphilic polymers). Useful nonionic polymers include polyurethanederivatives such as PEG-150/stearyl alcohol/SDMI copolymer. Suitablepolyether urethanes are Aculyn® 44 and Aculyn® 46 polymers sold by Rohm& Haas. Other useful amphiphilic polymers are disclosed in U.S. Pat. No.6,010,541 incorporated by reference. See also WO 01/62221 mentionedabove. Examples of anionic polymers that can be used as thickeners areacrylates copolymer, acrylates/ceteth-20 methacrylates copolymer,acrylates/ceteth-20 itaconate copolymer, and acrylates/beheneth-25acrylates copolymers. In the case of the associative type of thickeners,e.g., Aculyns 22, 44 and 46, the polymer may be included in one ofeither the hair dye composition or the developer composition of the hairdye product and the surfactant material in the another. Thus, uponmixing of the hair dye and developer compositions, the requisiteviscosity is obtained. The thickeners are provided in an amount toprovide a suitably thick product as it is applied to the hair. Suchproducts generally have a viscosity of from 1000 to 100000 cps, andoften have a thixotropic rheology.

pH Modifying agents: Suitable materials that are used to adjust pH ofthe hair dye compositions include alkalizers such alkali metal andammonium hydroxides and carbonates, especially sodium hydroxide andammonium carbonate, ammonia, organic amines includingmethylethanolamine, aminomethylpropanol, mono-, di-, andtriethanolamine, and acidulents such as inorganic and inorganic acids,for example phosphoric acid, acetic acid, ascorbic acid, citric acid ortartaric acid, hydrochloric acid, etc. See U.S. Pat. No. 6,027,538incorporated by reference.

Conditioners: Suitable materials include silicones and siliconederivatives; hydrocarbon oils; monomeric quaternary compounds, andquaternized polymers. Monomeric quaternary compounds are typicallycationic compounds, but may also include betaines and other amphotericand zwitterionic materials that provide a conditioning effect. Suitablemonomeric quaternary compounds include behentrialkonium chloride,behentrimonium chloride, benzalkonium bromide or chloride, benzyltriethyl ammonium chloride, bis-hydroxyethyl tallowmonium chloride,C12-18 dialkyldimonium chloride, cetalkonium chloride, ceteartrimoniumbromide and chloride, cetrimonium bromide, chloride and methosulfate,cetylpyridonium chloride, cocamidoproypl ethyldimonium ethosulfate,cocamidopropyl ethosulfate, coco-ethyldimonium ethosulfate,cocotrimonium chloride and ethosulfate, dibehenyl dimonium chloride,dicetyldimonium chloride, dicocodimonium chloride, dilauryl dimoniumchloride, disoydimonium chloride, ditallowdimonium chloride,hydrogenated tallow trimonium chloride, hydroxyethyl cetyl dimoniumchloride, myristalkonium chloride, olealkonium chloride, soyethomoniumethosulfate, soytrimonium chloride, stearalkonium chloride, and manyother compounds. See WO 98/27941 incorporated by reference. Quaternizedpolymers are typically cationic polymers, but may also includeamphoteric and zwitterionic polymers. Useful polymers are exemplified bypolyquaternium-4, polyquaternium-6, polyquaternium-7, polyquaternium-8,polyquaternium-9, polyquaternium-10, polyquaternium-22,polyquaternium-32, polyquaternium-39, polyquaternium-44 andpolyquaternium-47. Silicones suitable to condition hair are dimethicone,amodimethicone, dimethicone copolyol and dimethiconol. See also WO99/34770 published Jul. 15, 1999, incorporated by reference, forsuitable silicones. Suitable hydrocarbon oils would include mineral oil.

Conditioners are usually present in the hair dye composition in anamount of from about 0.01 to about 5% by weight of the hair dyecomposition.

Direct Dyes: The hair dyeing compositions according to the invention canalso contain compatible direct dyes including Disperse Black 9, HCYellow 2, HC Yellow 4, HC Yellow 15, 4-nitro-o-phenylenediamine,2-amino-6-chloro-4-nitrophenol, HC Red 3, Disperse Violet 1, HC Blue 2,Disperse Blue 3, and Disperse Blue 377. These direct dyes can becontained in the hair coloring compositions of the invention in anamount of from about 0.05 to 4.0 percent by weight.

Natural ingredients: For example, proteins and protein derivatives, andplant materials such as aloe, chamomile and henna extracts.

Other adjuvants include polysaccharides, alkylpolyglycosides, buffers,chelating and sequestrant agents, antioxidants, and peroxide stabilizingagents as mentioned in WO 01/62221, etc.

The adjuvants referred to above but not specifically identified that aresuitable are listed in the International Cosmetics Ingredient Dictionaryand Handbook, (Eighth Edition) published by The Cosmetics, Toiletry, andFragrance Association, incorporated by reference. In particularreference is made to Volume 2, Section 3 (Chemical Classes) and Section4 (Functions) are useful in identifying a specific adjuvant to achieve aparticular purpose or multipurpose.

The above-mentioned conventional cosmetic ingredients are used inamounts suitable for their functional purposes. For example, thesurfactants used as wetting agents, associative agents, and emulsifiersare generally present in concentrations of from about 0.1 to 30 percentby weight, the thickeners are useful in an amount of from about 0.1 to25 percent by weight, and the hair care materials are typically used inconcentrations of from about 0.01 to 5.0 percent by weight.

The hair dyeing product composition as it is applied to the hair, i.e.,after mixing the hair dye composition according to the invention and thedeveloper, can be weakly acidic, neutral or alkaline according to theircomposition. The hair dye compositions can have pH values of from about6 to 11.5, preferably from about 6.8 to about 10, and especially fromabout 8 to about 10. The pH of the developer composition is typicallyacidic, and generally the pH is from about 2.5 to about 6.5, usuallyabout 3 to 5. The pH of the hair dye and developer compositions isadjusted using a pH modifier as mentioned above.

In order to use the hair coloring composition for dyeing hair, theabove-described hair coloring compositions according to the inventionare mixed with an oxidizing agent immediately prior to use and asufficient amount of the mixture is applied to the hair, according tothe hair abundance, generally from about 60 to 200 grams. Some of theadjuvants listed above (e.g., thickeners, conditioners, etc.) can beprovided in the dye composition or the developer, or both, depending onthe nature of the ingredients, possible interactions, etc., as is wellknown in the art.

Typically, hydrogen peroxide, or its addition compounds with urea,melamine, sodium borate or sodium carbonate, can be used in the form ofa 3 to 12 percent, preferably 6 percent, aqueous solution as theoxidizing agent for developing the hair dye. Oxygen can also be used asthe oxidizing agent. If a 6 percent hydrogen peroxide solution is usedas oxidizing agent, the weight ratio of hair coloring composition anddeveloper composition is 5:1 to 1:5, but preferably 1:1. In general, thehair dyeing composition comprising primary intermediate(s) andcoupler(s), including at least one of the compounds of formula (1), isprepared and then, at the time of use, the oxidizing agents, such asH₂O₂, contained in a developer composition is admixed therewith until anessentially homogenous composition is obtained, which is applied shortlyafter preparation to the hair to be dyed and permitted to remain incontact with the hair for a dyeing effective amount of time. The mixtureof the oxidizing agent and the dye composition of the invention (i.e.,the hair dye product composition) is allowed to act on the hair forabout 2 to about 60 minutes, preferably about 15 to 45, especially about30 minutes, at about 15 to 50° C., the hair is rinsed with water, anddried. If necessary, it is washed with a shampoo and rinsed, e.g., withwater or a weakly acidic solution, such as a citric acid or tartaricacid solution. Subsequently the hair is dried. Optionally, a separateconditioning product may also be provided.

Together the hair dye composition of the present invention comprisingthe hair dye primary intermediate (1) and the developer compositioncomprising the oxidizing agent form a system for dyeing hair. Thissystem may be provided as a kit comprising in a single package separatecontainers of the hair dye composition, the developer, the optionalconditioner or other hair treatment product, and instructions for use.

Especially useful primary intermediates of formula (1) of this inventionwill provide hair coloring compositions having outstanding colorfastness, especially light fastness, fastness to washing and fastness torubbing.

Dyeing Example 1

The following composition shown in Table 1 can be used for dyeingPiedmont hair. 100 g of the dyeing composition is mixed with 100 g 20volume hydrogen peroxide. The resulting mixture is applied to the hairand permitted to remain in contact with the hair for 30 minutes. Thedyed hair is then shampooed, rinsed with water and dried. The ranges ofingredients set out in Table 1 are illustrative of useful concentrationsof the recited materials in a hair dye product.

TABLE 1 Composition for Dyeing Hair Ingredients Range (wt %) Weight (%)Cocamidopropyl betaine  0-25 17.00 Polyquaternium-22 0-7 5.00Monoethanolamine¹  0-15 2.00 Oleic Acid  2-22 0.75 Citric Acid 0-3 0.1028% Ammonium hydroxide¹  0-15 5.00 Behentrimonium chloride 1-5 0.50Sodium sulfite 0-1 0.10 EDTA 0-1 0.10 Erythorbic acid 0-1 0.40Ethoxydiglycol  1-10 3.50 C11-15 Pareth-9 (Tergitol 15-S-9) 0.5-5   1.00C12-15 Pareth-3 (Neodol 25-3) 0.25-5   0.50 Isopropanol  2-10 4.00Propylene glycol  1-12 2.00 p-phenylenediamine 0-5 1 mmole N,N-Bis(hydroxyethyl)-p-phenylene 0-5 1 mmole  diamine3-Methyl-p-aminophenol 0-5 1 mmole  p-Aminophenol 0-5 1 mmole  PrimaryIntermediate of this invention 0.5-5   4 mmoles 5-Amino-2-Methyl Phenol²0-5 3 mmoles 2,4-Diaminophenoxyethanol² 0-5 3 mmoles M-Phenylenediamine²0-5 1 mmole  Water qs to 100.00 qs to 100.00 ¹In the aggregate, theseingredients are in the range of 2 to 15% by weight. ²At least one ofthese dye precursors is typically present.

Exemplary combinations of hair coloring components employing a novelprimary intermediate of formula (1) of this invention are shown in Table1 and in combinations C1 to C136 in Tables A through H. Reading down thecolumns in e.g., Table A, the Xes designate the dye compounds (includingthe novel primary intermediates of the instant invention) that formillustratively suitable combinations of dyes that can be formulatedaccording to the present invention. For example, in Combination No. C1in Column 4 of Table A, a primary intermediate of Formula 1 of thisinvention, wherein R₁ and R₂ are defined hereinbefore, can be combinedwith 2-amino-phenol.

Especially preferred as the primary intermediates in Table 1 and incombinations C1 to C136 of Tables A through H are:

4-amino-2-(2-dimethylamino-ethyl)-phenol;

4-amino-2-(3-dimethylamino-propyl)-phenol;

4-amino-2-(2-diethylamino-ethyl)-phenol;

4-amino-2-(3-diethylamino-propyl)-phenol;

4-amino-2-(3-amino-propyl)-phenol;

4-amino-2-(2-piperidin-1-ylethyl)-phenol;

4-amino-2-(3-piperidin-1-ylpropyl)-phenol;

4-amino-2-[2-(pyridin-3-ylamino)ethyl]-phenol;

4-amino-2-(2-imidazol-1-ylethyl)-phenol;

4-amino-2-(2-morpholin-1-ylethyl)-phenol; and

4-amino-2-[2-(2-hydroxyethylamino)-ethyl]-phenol.

TABLE A Dye Combinations Structure IUPAC Name Name C1 C2 C3 C4 C5 C6 C7C8 C9 C10 C11

X X X X X X X X X X X

2-Methyl-benzene-1,4- diamine p-Toluene-diamine

Benzene-1,4-diamine p-Phenylene-diamine

2-[(4-Amino-phenyl)-(2- hydroxy-ethyl)-amino]- ethanolN,N-Bis(2-hydroxy- ethyl)-p-phenylene- diamine

1-(2,5-Diamino-phenyl)- ethanol 1-Hydroxyethyl-p- phenylenediamine

4-Amino-3-methyl- phenol 3-Methyl-p- aminophenol

2-Amino-phenol o-Aminophenol X X

Benzene-1,3-diol Resorcinol X X X

2-Methyl-benzene-1,3- diol 2-Methyl-resorcinol X X

Naphthalen-1-ol 1-Naphthol X

2-Methyl-naphthalen-1- ol 2-Methyl-1-naphthol X

2-(2,4-Diamino- phenoxy)-ethanol 2,4-Diamino- phenoxyethanol X

Benzene-1,3-diamine m-Phenylenediamine X

3-Amino-phenol m-Aminophenol X

5-Amino-2-methyl- phenol 2-Hydroxy-4- aminotoluene X

2-(4,5-Diamino-pyrazol- 1-yl)-ethanol 1-Hydroxyethyl-4,5-diamino-pyrazole

TABLE B Dye Combinations Structure C12 C13 C14 C15 C16 C17 C18 C19 C20

X X X X X X X X X

X X X

X

X X X X X X X

X

X

X

X

X

X

X

Structure C21 C22 C23 C24 C25 C26 C27 C28 C29

X X X X X X X X X

X X X X X X X X X

X

X X X

X

X X

X

X

X

X

X

TABLE C Dye Combinations Structure C30 C31 C32 C33 C34 C35 C36 C37 C38

X X X X X X X X X

X X X X X

X X X X

X

X X X X X X

X

X

X

X

X

X

X

Structure C39 C40 C41 C42 C43 C44 C45 C46 C47

X X X X X X X X X

X X X X X X X X X

X

X X X X

X

X

X X

X

X

X

X

TABLE D Dye Combinations Structure C48 C49 C50 C51 C52 C53 C54 C55 C56

X X X X X X X X X

X X X X

X X X X X

X

X X X X X

X

X

X

X

X

X

X

Structure C57 C58 C59 C60 C61 C62 C63 C64 C65

X X X X X X X X X

X X X X X X X X X

X

X X X X X

X

X

X

X X

X

X

X

TABLE E Dye Combinations Structure C66 C67 C68 C69 C70 C71 C72 C73 C74

X X X X X X X X X

X X X X X X

X X X

X

X X X X

X

X

X

X

X

X

X

X X X X X X Structure C75 C76 C77 C78 C79 C80 C81 C82 C83

X X X X X X X X X

X X X

X

X X X X X X

X

X

X

X

X X

X

X

X X X X X X X X X

TABLE F Dye Combinations Structure C84 C85 C86 C87 C88 C89 C90 C91 C92

X X X X X X X X X

X X X X X X X

X

X X X

X

X

X

X

X

X

X

X X X X X X X X X Structure C93 C94 C95 C96 C97 C98 C99 C100 C101

X X X X X X X X X

X X

X X X X X X X

X

X

X

X

X

X

X

X

X

X X X X X X X X X

TABLE G Dye Combinations Structure C102 C103 C104 C105 C106 C107 C108C109 C110

X X X X X X X X X

X X

X X X X X X X

X

X

X

X

X

X

X

X

X

X X X X X X X x x Structure C111 C112 C113 C114 C115 C116 C117 C118 C119

X X X X X X X X X

X X X X X X X

X X

X

X X X X X X X

X

X

X

X

X

X X

X

x x x x x x x x x

TABLE H Dye Combinations Structure C120 C121 C122 C123 C124 C125 C126C127 C128

X X X X X X X X X

X

X X X X X X X X

X

X X X X X X X X X

X

X

X

X

X

X

X X

x x x x x x x x x Structure C129 C130 C131 C132 C133 C134 C135 C136

X X X X X X X X

X X X X X X X X

X

X X X X X X X X

X

X

X

X

X

X

X

x x x x x x x x

With the foregoing description of the invention, those skilled in theart will appreciate that modifications may be made to the inventionwithout departing from the spirit thereof. Therefore, it is not intendedthat the scope of the invention be limited to the specific embodimentsillustrated and described.

We claim:
 1. A compound of formula (1):

wherein R₁ and R₂ are each independently selected from the group consisting of a hydrogen atom and C₁ to C₅ alkyl group, or R₁ and R₂ together with the nitrogen atom to which they are attached form a S or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R₁ and R₂ may be hydrogen.
 2. A compound of claim 1 wherein R₁ and R₂ are each individually selected from the group consisting of hydrogen atom, a C₁ to C₃ alkyl group, or R₁ and R₂ together with the nitrogen atom to which they are bound form a piperazine, piperidine, imidazole, or morpholine ring.
 3. A compound of claim 2 wherein R₁ and R₂ are both alkyl groups.
 4. A compound of claim 2 wherein R₁ and R₂ form a piperidine ring.
 5. A compound of claim 3 wherein R₁ and R₂ form an imidazole ring.
 6. A compound of claim 3 wherein R₁ and R₂ are both methyl. 